Along these same lines would be the choice between manual and powerassisted systems. Residual Pressure Valves are used in both front and rear brake systems as follows: 2psi valvesthese Designing Your Brake System.
Once you are over 40 psi line pressure there is no benefit to having this valve. 2. It acts as a PROPORTIONING VALVE. It sets front to rear braking ratio. That is, it lets the front brakes have a little more pressure than the rears. It does the job of a RESIDUAL PRESSURE VALVE.
It keeps 10 PSI in the drum Hold the brake pressure to the front or rear brakes to hold the vehicle on a hill or the starting line at the drags. Easy to do a burn out by locking the front tires and releasing the back brakes with A brake proportioning valve simply adjusts pressure on a brake circuit. Most vehicles use a little less line pressure on the rear brakes to keep them from locking up in a panic stop. The actual requirement can vary from vehicle to vehicle, as many have different tire sizes and front to rear weight distribution.
BRAKE TROUBLESHOOTING GUIDE Check for damaged brake hoses that may be internally expanding from the line pressure. (See Check Flexible Brake Hoses) Use line locks (vicegrips) to restrict fluid flow in the rubber lines at each wheel between the frame and the axle to help pinpoint the trouble spot. The function of the proportioning valve Aug 07, 2018 Installing brake residual valve? Discussion in 'The Hokey Ass Message Board' started by TP, Jan 25, 2008. The valves hold line pressure that would otherwise be forced back into the MC because of the wheel spring hardware pulling the shoes back against the wheel cylinder.
I have just gone through the same thing with my Merc after upgrading How To Install Disc Brake Conversion Kit When changing from a manual brake system to a power system, the clevis assembly that attaches the push rod to the brake pedal must be removed and lowered one inch. Drum brakes require the use of a 10 lb residual pressure valve in the line This residual pressure counter balances the drum brake Wilwood two pound and ten pound residual pressure valves retain a minimum brake line pressure to help eliminate excessive pedal travel in both disc and drum brake systems.
This residual valve will maintain pressure on the drum brakes to counter the spring pressure in the system. This keeps the shoes out close to the drum, giving a higher, firmer pedal. Drum brakes require a 10 lb. residual pressure (RPV10) to counteract the spring tension in the drum system which tends to pull the shoes away from the drums. The best way to plumb a discdisc system when the master is under the firewall is with a four wheel disc brake combination valve (PV4) and a two pound residual valve (RPV2) to the A ten pound residual valve will maintain a line pressure to the rear to keep the drum brake shoes out close to the drums giving a higher firmer pedal.
Without a ten pound residual pressure to the rear you will experience a spongy pedal. Selecting the correct adjustable proportioning valve for your vehicle entails not only selecting the proper point at which slope limiting begins (the kneepoint), but also selecting the proper rate at which rear brake line pressure builds after that point (the slope).